Three years ago, Serizawa was troubled with about his psychic powers. One day, he was visited by the boss, Suzuki Toichiro. Serizawa ends up trusting him since he's the first person to understand what he's going through. But Mob then brings up the fact that Serizawa is being used and tells him, "I'll be your friend." Hearing Mob say that, Serizawa... 

Meanwhile, after defeating Sho, the boss starts gathering up the energy he was sharing with his followers and turns into an energy monster.
I mean, look at what
your own father has done to you.
أعني أنّ والدك قد فعلَ بك كلّ هذا
Vor allem wenn dein eigener
Vater dir so etwas antut.
Peleas contra tu propio padre.
Tu propio padre se enfrentó a ti.
Rien que de penser
que ton propre père t’a amoché…
Cioè, già solo il fatto che tuo padre
abbia fatto tutto questo...
Quer dizer, seu pai fez tudo isso com você.
Собственный отец так тебя избил...